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为AppInventor2开发拓展(Extension) · App Inventor 2 中文网
...原生组件实现不了的、更加强大的功能。
一般拓展采用java/kotlin语言进行开发，由于拓展开发相当于直接使用安卓原生开发语言开发安卓相关功能，因此理论上拓展可以实现任何的安卓功能。
注意：java/kotlin写出来的拓展只能...
Converting Secret Key into a String and Vice Versa
...ing and use it in a SecretKeySpec to rebuild your original SecretKey.
For Java 8
SecretKey to String:
// create new key
SecretKey secretKey = KeyGenerator.getInstance("AES").generateKey();
// get base64 encoded version of the key
String encodedKey = Base64.getEncoder().encodeToString(secretKey.ge...
How can I lock a file using java (if possible)
I have a Java process that opens a file using a FileReader. How can I prevent another (Java) process from opening this file, or at least notify that second process that the file is already opened? Does this automatically make the second process get an exception if the file is open (which solves my p...
Best approach for GPGPU/CUDA/OpenCL in Java?
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AFAIK, JavaCL / OpenCL4Java is the only OpenCL binding that is available on all platforms right now (including MacOS X, FreeBSD, Linux, Windows, Solaris, all in Intel 32, 64 bits and ppc variants, thanks to its use of JNA).
It has ...
How to change an Eclipse default project into a Java project
...default" project. What is the easiest way to quickly convert this into a "Java" project?
11 Answers
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Do interfaces inherit from Object class in java
Do interfaces inherit from Object class in Java?
7 Answers
7
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Meaning of Choreographer messages in Logcat [duplicate]
...ty to be considered "background" (AsyncTask's are "background" by default, java.lang.Thread is not)
Generating lots of garbage, causing the garbage collector to "stop the world" - including the main thread - while it cleans up
To actually determine the specific cause you'll need to profile your a...
Java's L number (long) specification
It appears that when you type in a number in Java, the compiler automatically reads it as an integer, which is why when you type in (long) 6000000000 (not in integer's range) it will complain that 6000000000 is not an integer. To correct this, I had to specify 6000000000L . I just learned abo...
How to read the value of a private field from a different class in Java?
... @legend you can install a security manager to forbid such access. Since Java 9, such access is not supposed to work across module borders (unless a module is open explicitly), though there’s a transitional phase regarding enforcement of the new rules. Besides that, requiring additional effort l...
Where is the Keytool application?
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keytool is part of the standard java distribution.
In a windows 64-bit machine, you would normally find the jdk at
C:\Program Files\Java\jdk1.8.0_121\bin
It is used for managing keys and certificates you can sign things with, in your case, probably a ja...